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7 days after fracture, there was no difference in the densities of macrophages and neutrophils in fracture callus between Ju:MA and MA:MA as well as between MA:Ju and Ju:Ju. However, the cell densities were significantly higher in juvenile hosts than middle-aged hosts regardless of the ages of donors (p<0.001 for both cell types; n = 6 each chimeric group)
